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Traffic signal controller VHDL design tasks: the crossroads traffic lights simulate the working process, the use of two sets of experimental board red, yellow, green LED as traffic lights, to design a traffic signal controller. Requirements: (1) traffic lights from green to red, the 4 seconds the yellow light interval (2) traffic lights red to green is a direct, no interval of time (3) main road on the green time is 40 seconds , branch roads of the green time of 20 seconds (4) at any time, display the status of each state to the end of time